I used a silver Sharpie but you can use whatever you want as long as it shows up on the board clearly!

I used this center punch to make starting points in the board where I had marked with Sharpie. If you don't have a center punch you can skip this step. I find it useful to use one whenever my drilling needs to be precise. 

The drill I had wouldn't hold the small drill bit I needed so I ended up using a dremel.

I used some simple split rings and fishhook earrings you can get at any craft store! Woohoo! You're now the proud owner of some bad-ass blinky earrings!